# -*- coding: utf-8 -*-

# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals
import random
# 在settings.py 中导入 USER_AGENTS
from .settings import USER_AGENTS
import requests
import json
import time


class CutMovieSpiderMiddleware(object):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, dict or Item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request, dict
        # or Item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class CutMovieDownloaderMiddleware(object):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class RandomUserAgent(object):
    def process_request(self, request, spider):
        user_agent = random.choice(USER_AGENTS)
        request.headers.setdefault("User-Agent", user_agent)

# class RandomProxy(object):
#     def __init__(self):
#         self.ip = None
#         self.cur_time = 0
#
#     def get_random_ip(self):
#         # api链接
#         api_url = "https://dps.kdlapi.com/api/getdps/?orderid=937181745174071&num=1&pt=1&format=json&sep=1"
#
#         headers = {"Accept-Encoding": "gzip"}  # 使用gzip压缩传输数据让访问更快
#
#         r = requests.get(url=api_url, headers=headers)
#         content = json.loads(r.text)
#         IP = content['data']['proxy_list'][0]
#         # print(IP)
#         return 'http://' + IP
#
#     def process_request(self, request, spider):
#         if time.time() - self.cur_time > 60 or not self.ip:
#             self.ip = self.get_random_ip()
#             self.cur_time = time.time()
#         print("Current IP:Port is", self.ip)
#
#         #将代理IP加入
#         request.meta['proxy'] = self.ip
